A tube coupling nut with the shank end accommodating a smaller tube size than is accommodated by the tube fitting which connects to the threaded end.
NSN 5910-01-550-7184
NSN 5935-01-265-1111
NSN 5985-01-533-7075
NSN 6220-01-424-2478
NSN 5910-01-074-8450
NSN 6610-00-025-1878
NSN 6145-00-350-0167
NSN 6240-01-374-4660
NSN 5960-01-325-2241
NSN 6610-00-419-0315
NSN 6610-00-701-2600
NSN 6220-00-588-1046